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Also known as application server tier. The logical layer between a user interface or Web client and the database. This is typically where the Web server resides, and where business objects are instantiated. The middle tier is a collection of business rules and functions that generate and operate upon information. They accomplish this through business rules, which can change frequently, and are thus encapsulated into components that are physically separate from the application logic itself. See also client tier, data source tier.
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